[PATCH RFC 2/8] golang/xenlight: Add error constants and standard handling

[Ronald Rojas <ronladred@gmail.com>]

Create error type Errorxl for throwing proper xenlight
errors.

Update Ctx functions to throw Errorxl errors.

Signed-off-by: Ronald Rojas <ronladred@gmail.com>
---
 tools/golang/xenlight/xenlight.go | 75 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 74 insertions(+), 1 deletion(-)

diff --git a/tools/golang/xenlight/xenlight.go b/tools/golang/xenlight/xenlight.go
index f82e14e..eee2254 100644
--- a/tools/golang/xenlight/xenlight.go
+++ b/tools/golang/xenlight/xenlight.go
@@ -38,10 +38,72 @@ import (
 	"unsafe"
 )
 
+/*
+ * Errors
+ */
+
+type Error int
+
+const (
+	ErrorNonspecific                  = Error(-C.ERROR_NONSPECIFIC)
+	ErrorVersion                      = Error(-C.ERROR_VERSION)
+	ErrorFail                         = Error(-C.ERROR_FAIL)
+	ErrorNi                           = Error(-C.ERROR_NI)
+	ErrorNomem                        = Error(-C.ERROR_NOMEM)
+	ErrorInval                        = Error(-C.ERROR_INVAL)
+	ErrorBadfail                      = Error(-C.ERROR_BADFAIL)
+	ErrorGuestTimedout                = Error(-C.ERROR_GUEST_TIMEDOUT)
+	ErrorTimedout                     = Error(-C.ERROR_TIMEDOUT)
+	ErrorNoparavirt                   = Error(-C.ERROR_NOPARAVIRT)
+	ErrorNotReady                     = Error(-C.ERROR_NOT_READY)
+	ErrorOseventRegFail               = Error(-C.ERROR_OSEVENT_REG_FAIL)
+	ErrorBufferfull                   = Error(-C.ERROR_BUFFERFULL)
+	ErrorUnknownChild                 = Error(-C.ERROR_UNKNOWN_CHILD)
+	ErrorLockFail                     = Error(-C.ERROR_LOCK_FAIL)
+	ErrorJsonConfigEmpty              = Error(-C.ERROR_JSON_CONFIG_EMPTY)
+	ErrorDeviceExists                 = Error(-C.ERROR_DEVICE_EXISTS)
+	ErrorCheckpointDevopsDoesNotMatch = Error(-C.ERROR_CHECKPOINT_DEVOPS_DOES_NOT_MATCH)
+	ErrorCheckpointDeviceNotSupported = Error(-C.ERROR_CHECKPOINT_DEVICE_NOT_SUPPORTED)
+	ErrorVnumaConfigInvalid           = Error(-C.ERROR_VNUMA_CONFIG_INVALID)
+	ErrorDomainNotfound               = Error(-C.ERROR_DOMAIN_NOTFOUND)
+	ErrorAborted                      = Error(-C.ERROR_ABORTED)
+	ErrorNotfound                     = Error(-C.ERROR_NOTFOUND)
+	ErrorDomainDestroyed              = Error(-C.ERROR_DOMAIN_DESTROYED)
+	ErrorFeatureRemoved               = Error(-C.ERROR_FEATURE_REMOVED)
+)
+
+var errors = [...]string{
+	ErrorNonspecific: "Non-specific error",
+	ErrorVersion: "Wrong version",
+	ErrorFail: "Failed",
+	ErrorNi: "Not Implemented",
+	ErrorNomem: "No memory",
+	ErrorInval: "Invalid argument",
+	ErrorBadfail: "Bad Fail",
+	ErrorGuestTimedout: "Guest timed out",
+	ErrorTimedout: "Timed out",
+	ErrorNoparavirt: "No Paravirtualization",
+	ErrorNotReady: "Not ready",
+	ErrorOseventRegFail: "OS event registration failed",
+	ErrorBufferfull: "Buffer full",
+	ErrorUnknownChild: "Unknown child",
+	ErrorLockFail: "Lock failed",
+	ErrorJsonConfigEmpty: "JSON config empty",
+	ErrorDeviceExists: "Device exists",
+	ErrorCheckpointDevopsDoesNotMatch: "Checkpoint devops does not match",
+	ErrorCheckpointDeviceNotSupported: "Checkpoint device not supported",
+	ErrorVnumaConfigInvalid: "VNUMA config invalid",
+	ErrorDomainNotfound: "Domain not found",
+	ErrorAborted: "Aborted",
+	ErrorNotfound: "Not found",
+	ErrorDomainDestroyed: "Domain destroyed",
+	ErrorFeatureRemoved: "Feature removed",
+}
 
 /*
  * Types: Builtins
  */
+
 type Context struct {
 	ctx *C.libxl_ctx
 }
@@ -51,6 +113,17 @@ type Context struct {
  */
 var Ctx Context
 
+func (e Error) Error() string{
+	if 0< int(e) && int(e) < len(errors){
+		s:= errors[e]
+		if s != ""{
+			return s
+		}
+	}
+	return fmt.Sprintf("libxl error: %d", -e)
+
+}
+
 func (Ctx *Context) IsOpen() bool {
 	return Ctx.ctx != nil
 }
@@ -83,4 +156,4 @@ func (Ctx *Context) CheckOpen() (err error) {
 		err = fmt.Errorf("Context not opened")
 	}
 	return
-}
\ No newline at end of file
+}
-- 
2.7.4


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